KENWOOD TL 922A User Manual

User Manual: Pdf KENWOOD--TL-922A-User-Manual

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AFTER uNpAcKING
Itjsadvisableto savealIoriginalpackingcartons(innerand
outer) to protect your valuable Linear Am plifier from
damage should you wish to transportitforremote opera-

CA UTlO N
Read Operating ManualSection 2 before proceeding to
unpackand assem bleyouram pIifier.
w A RN ING

tion orship it for after-sales service.
The foIlowing explicit definitions apply in this m anual.Be

LETHA L VOlTAGES PRESENT.

s
uretor
eadthes
edefi
ni
ti
ons.
NOTE =

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If disregarded, inconvenience onl
y - no

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daMage orperSOnalinjUry.

j

CAUTlON = equipm ent damage m ay occur, but not

personalinjury.
WARNING m personal injury may occur - do not dis-

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regard.
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CoNTENTS
rL.g22A spEclFlcATIoNs ...................3
Ecrlo N 1 FEAruREs ...................4
sEcr o N 2 pREpA RArloN fOR USf .........5
2.1 Accessor;es
2,2 lnstallation of Power Tubes
2.3 ceneralTips on lnstallation
2.q AC pow er Source
2.5 Line Voltage Change
2.6 pow er Cable
2.7 Excìter
2.8 Antenna
2.9 Interconnection
2.g.1 cround;ng
2.9.2 Cable Connection
sEcrloN 3 CoNrRo Ls AND THElR FUNCTlONS .9
3.1 Front panel
3.2 Rear Panel
sEcTIoN 4 opERArlo N ........,......... 11
q.1 prechecks
q.2 CW Operation
q.3 SSB operat;on
q,q RTTY Operation
-q.5 Sett;ng the A LC ADJ ControI

q.6 Ad;usting the Rf OutputMeter
q.7 H igh-Voltage Transform er Protection
.8 Carrying Your TL-922A
sEcrloN 5 c Rculr 0 EsCR prlo N ...........13
5.1 Linear pow er Am plifjer
5.2 Power Supply
5.3 Fan M otor DeIay Stop Circuit
5.Q Meter Drive Circuit
5.5 Spark Suppressor

2

SECTlON 6 MA INTENA NCE .........,...... 15
6.1 InternalCleaning
6.2 Replacing Pow er Fuses
6.3 Replacing Pow er Tubes
6,4 lnpUt MatChin9 CirCUit
SECTlON 7 TROU BlESHOOTIN G HlNTS .,,... 16
PA CKIN G ................................ 17
lNTERNA L PA RT LOCATlO NS ..,.,,.,.,.,,,, 18
SCH EM ATIC D IA GRAM ..................., 19

IlLU ST RATIO N S
Fig. 2- 1 UpperCase CoverAssembl
y/
Disassembl
y ,....................
Fig.2-2 Correct Pow er Tube Handling ........
Fig.2-3 Parasìtic Suppressor CoilM ounting ....
Fig.2-4 lnput Voltage Term inal Boards .......
fig.2-5 Power Cable Color Code ............
Fig.2-6 Exciter Connections for R L and A LC

5
5
6
7
8

Controls ........................ 8
Fig.2-7 Interconnection of the TL-922A ...... 8
Fig.3-1 Front View ...................... 9
Fig.3-2 Rear View ...................... 1O

Fig.5-1 Linear PowerAmplifierCircui
t ....... 13
Fig.5-2 Transformer PriMarY Current Flow ..... 14
Fi9.5m3 Fan M OtOr DelaY StOp CirCUi
t ........ 14
Fig.5-4 M eter Drive Circuit ................ 14
Fi9.7-1 PaCkín9 fOr Shipment .............. 17
Fi9. 7-2,3TOp,BOttOm View S ...,,.,......... 18
rA BLEs
1. frOnt Panel COntrOIS Set-Up .............. 11
2 TUne and LOad Ini
tialSe in9S
11

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TL-922A S pEC IFICA TIO S
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Transm it Frequency Range"
.

160 m through 15m A m ateur Bands

Excitation Energy Required"
.
Mode and Duty Cycle.

80 W nom inal, 120 W m axim um
SSB,continuous for 30 m inutes.
CW and RTTY ,key own continuousfor 1O m inutes.

Rated Plate lnput.

2 kW P.E.P.SSB,1 kW CW RTTY

Plate Voltage"
.(athlo signal)

3.1 kV SSB,2.2 kV CW RTTY

Circuit Type:

CIass A B2 grounded grid linear am plifier

3rd Order Jnterm oduIation D istortion;
lnput lm pedance"
.

Below -30dB.
50 n ,unbalanced at better than 1.5 SW R

Output lm pedance.

50 to 75 n ,unbalanced.

Cooling"
.
lnterlock Satety Features;
Therm alProtector;

Forced A ir.
Prim ary high voltage circuit cut-off.
Secondary high-voltage circuit grounding.
Locks out transm it relays if H .V.pow er transform er overheats.

fan MotorDelay Stop Tim e;

140 +
- 30 seconds. (atroom temperature)

A LC;

Negative going,adjustablethreshoId -8V C maxim um output (typical).

power Tubes U sed.
Q m iconductors:

Eim ac 3-500Z ,tw o pieces
iodes, 18 pieces

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lener diode, 1 piece

powerRequ;rem ents.
Cablegsuppl;ed.

120V,28A ;240V,1qA ;50/60H ;form axim um SSB input.
Si
gnalcable (coaxial)with U H F-type connector,1.5m.
Controlcable, 1.5m .

Dimensions;
Weight.

390m m x 19O mm X 407m m (15-3/8 X 7-1/2X 16')
Net3tkg (68 Ibs.)
Shipping 38 kg (83 Ibs.)

The above specifi
cations are subjectto change w i
thoutnotice dueto technicalim provem ent.

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s EC T IO N 1. FEA T U R ES

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1.

The T L-922A is a Class AB2, grounded grid linear
am plifier developed by Trio-Kenwood through advanced high-power technology using tw o high-performance Eim ac 3-500l power tubes. lt covers all
bands 160 m through 15 m for SSB,CW and R TTY

linearity,and the CW Mode for low powerconsum ption and heat generation during extended periods of
operation.
8.

m odes of operation.

2.

3.

This switch iscapable of setting yourT L-922A in the
straight-through state irrespective of the standby
control on the exciter.

Unprecedented Reliabjli
The T L-922A isdesigned to provide stable,high RF
oUtputpowerrorextended per;odsorcont;nuoususe.
Eng;neered w;th Tr;o_Kenwood,sadvanced c;rcu;tand
caItechnoIogy, the T L_922A empIoys two
m echan;
d
3_
5ooz powertubesto the;rruIIadvantage.
rugge

linearAmpIification ControlSw itch

9.

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VariabIe Threshold Level (A LC Detector)

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The A LC circuit wiIlaccomm odate exciterS of 80 w

,

to 120 w (nom inal)by varying the A LC threShold
Ievel. This effectively prevents overdriving the final
powertubes, ;m ;t;ng the Am pI;f:erto :ts l:near range
and gUaranteein9 lOW diStOrtiOn atM aXim UM POWef

low ntermod,lat;on D ;stort;on

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Intermodulation distortion (lM D) is m inim ied
through the useofnegative R.f.feedback.

q.

1O. Two PanelM etert

ln adjusting ormonitoring yourTL-922A,one meter
aIwaysindicatesthe (lp)platecurrent;while,with'the
other,you may read (Ig)grid current,(RF)relative
output,or(HV)high vol
tage. Thisfacili
tatesease of

Qu;c Turn.on
W arm-up isnot necessary.The 3.500Z tubesarefast
heatjng.

operation of your TL-922A.
5.

6.

FullSafety System
To protectyou against any possible high voltage electr;c shock,yourT L-922A has a double safety system

11. Rigid MechanicalStructure
Thedie-cast side panelseffectiveIy supportthe weight

comprised of interlocking switches. One interrupts

of the am plifier against shocks and jarring during

the high voI
tage primary circuit w hile the second
directly grounds the secondary high voltage circuit.
Also provi
ded are bleederresistorsfordischarging the
high voltage capacitors and ''DA NG ER''warnings at
high voltage positions. Please observe all warnings,
they are for your protection.

transportation. Recessed side panelhandles are provided so the Am pIi
fiercan be easil
y carried.

is rem oved from the un;t and w iII measurably extended tube life.

.

7.

Mode Switch forEffic;ent LinearOperation
M O D f switching js provided to select between the
SSB Mode for the maxim um PEP outputw ith good

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12. Vernier Plate Tuning 0ial
The PLAT E tune dial is equipped with a reduction
gear that facilitates easy tuning, particularly for the

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higher bands. lt also effectively preventsaccidental

'
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m iss-tuning during operation. Controls and panel
arrangement, designed to hum an engineering
standards, provide superior ease of operation.

'
,
.

hlewly-0eveIoped fan Motor0elay Stop Circuit
To reduce power tube deterioration, yourT L-922A
has a newly-developed fan m otor delay-stop circuit
com prised of a thermaldelay relay.The cooling fan

wiIInormally run for1QO seconds (Typ)afterpower

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13.

eat,Contem porary Appearance
M echanjcalarrangementand sophisticated design tO
m atch any Trio-Kenw ood tranSCeiver OrtranSm itter.
Your TL-922A can aIso be used as a high-quality,
general purpose Amateur band Iinear am pIifier W ith
any exciter capable of 80W to 12OW Rf OUtpUt,

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2p;eces

6. Extensjon footJ02-OOQ9.14

.

2 pieces

7. Scr$ws,4 x 12m m long N30-QO12-46
8. Platg cap F02-0407-04
g. paras;t;csuppr$ssor ;I,,;ghih,nd
L3g-o4o1-o5
1O. Parasiticsuppressorcoil,lefthand

2 pieces
2 pieces
1 p;ece
1 piece

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Q pi

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procedu res below. Prepare

pl't' CaP
par,s;t;, suppresso,co;' ,;ghth,,d
,,d Iefih,,d

re^,3 x 6 mm long
Ptain washer
Spring ^asher
Tools

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2 P,eces

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Sw,TcH
PLUNGER

4 pieces
4 pieces
Q pieces

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NOTE. A parts tray to prevent loss of m etri
c hardware is

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hetprul.

WARNlNr
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l$t.Th0METERswitchis$tth0HVposition
8nd th0 m ultím $t$r r0$ds OV.

Proceed as follow s. (Referto Fig.2-1)

2.

Remove the four 4 m m Phillips scre^s holding the
upper case cover.
Removethe uppercasecover.
.
.P' SCr'^S
R'MOV' !h' tOUr 3 ? M S'l!-"PP'n9 ph.
'iI!
and fOU, fl,t head Self-t,ppin9 PhillipSSCrew ShOldin9
the insideshield on the powertube enclosure.

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